[1] Borůvka O.: Linear Differential Transformations of the Second Order. The English University Press, London, 1971. MR 0463539

[2] Laitoch M.: A Modification of the Sturm’s Theorem on Separating Zeros of Solutions of a Linear Differential Equation of the 2nd Order. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 57, Math. 17 (1978), 27-33. MR 0554033 | Zbl 0429.34011

[3] Fialka M.: On the Position of Nodes of Associated Equations to the Differential Equation y" - q(t)y = r(t). Acta Univ. Palacki. Olomuc., Fac. rer. nat. 100, Math. 30 (1991), 107-120. MR 1166430

[4] Neuman F.: Global Properties of Linear Ordinary Differential Equations. Academia, Praha, 1991. MR 1192133 | Zbl 0784.34009

[5] Palát J.: Prilozhenie Teoremy Shturma. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 69, Math. 20 (1981), 77-83 MR 0645890

[6] Laitochová J.: The Sturm Comparison Theorem for i-Conjugate Numbers. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 97, Math. 29 (1990), 197-206 MR 1144838 | Zbl 0756.34014

[7] Staněk S.: Two Point Boundary Problem in a Second Order Nonhomogeneous Linear Differential Equation. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 61, Math. 18 (1979), 59-71. MR 0589848 | Zbl 0437.34012

[8] Kojecká J.: On Some Properties of Functions Relative to the Classes of Certain Factor Spaces. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 61, Math. 18 (1979), 29-34. MR 0589844 | Zbl 0442.34006

[9] Ponížil P., Vašut S., Novák P.: Sandvich Structures for Damping of Vibrations. Polymer Processing Society, European Regional Meeting, Sept. 21-24, 1992, Praha, Convention and Culture Centre, (1992), 139-140.

[10] Briš P., Ponížil P., Vašut S.: The Damping of the Vertical Vibrations with the Aid of the Bottom Parts of Shoe. Kožařství, 42 (1992), Odborná příloha, 3-4.

[11] Vašut S., Ponížil P., Voříšek M., Novák P.: Vibroisolating Properties of Structures from Polymeric Materials. Makrotest 1992, X. celost. konference, 2.-5. listopadu 1992, Seč u Chrudimi, Pobočka ČSPCH a. s. SYNPO Pardubice, (1992), 83-84.